CODEWITHSUNDEEP
c#command-line-parser
user5405648
user5405648

Reputation:

CommandLineParser: Required only if a value of another option is equal to?

Using https://github.com/commandlineparser/commandline

I would like to set an Option as "Required" if the value parsed from another Option is equal to a particular value.

    [Option('f', "foo", Required = true, HelpText = "Name of process")]
    public string Foo{ get; set; }

    [Option('b', "bar", Required = ( Foo == "egg" ), HelpText = "Name of process")]
    public string Bar{ get; set; }

Upvotes: 0

Views: 442

Answers (1)

Mustafa Özçetin
Mustafa Özçetin

Reputation: 2994

I don't think this is possible since .NET Attribute class has some restrictions to what kinds of arguments may be used with. You have to use a constant expression where you set the Required property. Your line

[Option('b', "bar", Required = ( Foo == "egg" ), HelpText = "Name of process")]

raises the explanatory compiler error (assuming Foo is a static property):

CS0182: An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type.

Upvotes: 0

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